1. ECGs traced on the ventral surface of the chest case were superimposed in a chart and deflection amplitudes were compared to each other to determine appropriate sites of the electrodes.
2. On the basis of results obtained, a negative electrode was placed on the Manubrium Sterni and a positive one on the Sternum close to the apex of the heart.
3. Transmitter subcutaneously implanted on the breast bone was pertinent for reducing the length of lead wire and minimizing the external noise.
4. Successive ECG tracings after dosage with Digitoxin and Quinidine were illustrated to show the possibility of miniaturized transmitter K6 in clinical use.